Smooth pictures in timeline

resources/qml/delegates/ImageMessage.qml

@@ -29,6 +29,8 @@ Item {
         source: model.data.url.replace("mxc://", "image://MxcImage/")
         asynchronous: true
         fillMode: Image.PreserveAspectFit
+        smooth: true
+        mipmap: true
 
         MouseArea {
             id: mouseArea